How do you check 2003 ram 5.9 diesel fan clutch?

To check the fan clutch on a 2003 Ram 5.9 diesel, first ensure the engine is off and cool. Start the engine and observe the fan operation; it should spin freely at low speeds and engage more as the engine warms up. You can also manually spin the fan; it should have some resistance but not be overly stiff. If the fan does not engage properly or spins too freely at higher temperatures, the fan clutch may need replacement.